We have two lessons this afternoon and [e ] lesson lasts about an hour.括号里面填什么?

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We have two lessons this afternoon and [e ] lesson lasts about an hour.括号里面填什么?
We have two lessons this afternoon and [e ] lesson lasts about an hour.括号里面填什么?

We have two lessons this afternoon and [e ] lesson lasts about an hour.括号里面填什么?
each

each